CT754 2020-08-13T05 21 08.068Z Unit 5 Designing Internet Systems and Servers(8hrs) PDF

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intranet and internet...

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Chapter-5. Designing Internet Systems and Servers [8 hours]

BCT IV/II

Internet and Intranet

5.1. Designing of Internet System Network Architecture 5.2. Choice of platforms 5.3. Server Concepts: WEB, Proxy, RADIUS, MAIL 5.4. Cookies 5.5. Load Balancing: Proxy Arrays 5.6. Server Setup and Configuration Guidelines 5.7. Security and System Administration Issues, Firewalls and Content Filtering In the late 1960s, the US Department of Defense decides to make a large network from a multitude of small networks, all different, which begin to abound everywhere in North America. We had to find a way to these networks coexist and give them an outdoor visibility, the same for all users. Hence the name of InterNetwork (interline), abbreviated as Internet, data this network of networks. The Intern Internet et archit architecture ecture is based on a simple idea: ask all networks want to be part of carrying a single packet type, a specific format the IP protocol. In addition, this IP packet must carry an address defined with sufficient generality in order to identify each computer and terminals scattered throughout the world. The user who wishes to make on this internetwork must store its data in IP packets that are delivered to the first network to cross. This first network encapsulates the IP packet in its own packet structure, the package A, which circulates in this form until an exit door, where it is decapsulated so as to retrieve the IP packet. The IP address is examined to locate, thanks to a routing algorithm, the next network to cross, and so on until arriving at the destination terminal. Layer 1 - Devi Devices ces an and d Their Functi Functions ons Defines the electrical, mechanical, procedural, and functional specifications for activating, maintaining, and deactivating the physical link between end systems. Some common examples are Ethernet segments and serial links like Frame Relay and T1 T1. Repe Repeaters aters that provide signal amplification are also considered Layer 1 devices. Fiber Cabel, CAT6 cable The physical interf interface ace on the N NIC IC can also be considered part of Layer 1. Layer 2 Devic Devices es and Their Fu Function nction nctionss Defines how data is formatted for transmission and how access to the physical media is controlled. These devices also provide an interface between the Layer 2 device and the physical media. Some common examples are a NIC installed in a host, bridg bridge, e, or sw switch itch itch. Layer 3 Devic Devices es and Their Functi Functions ons Provides connectivity and path selection between two host systems that might be located on geographically separated networks. In the case of a host, this is the path between the data link layer and the upper layers of the NOS. In the case of a router, it is the actual path across the network. Appro Approach ach to Netw Network ork Desig Design n • necessity to account for all seven layers of the OSI model when creating a design for a network • As well as accounting for that all important eighth layer, in other words the political factors that always have an effect on any technical decision • Network design must be a complete process that matches business needs to the available technology to deliver a system that will maximize the organization Netw Network ork Desig Design n St Steps eps • Identifying Customer Needs/Goals – Analyzing Business Goals, Constraints and Technical Goals, Tradeoffs – Characterizing the Existing Network and Network Traffic • Logical Network Design – Designing a Network Topology and Models for Addressing, Naming – Selecting Switching and Routing Protocols – Developing Network Security Strategies and Network Management Strategies • Physical Network Design – Selecting Technologies and Devices for Campus Networks or Enterprise Networks • Testing Optimizing Documenting – Testing the Network Design – Optimizing the Network Design – Documenting the Network Design 5.1. De Designing signing of In Internet ternet Syste System m Netw Network ork Arc Architect hitect hitecture ure Design consi consideratio deratio derations ns • Budget

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Chapter-5. Designing Internet Systems and Servers [8 hours]

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BCT IV/II

Internet and Intranet

Nature of applications Availability of expertise Fault tolerance in terms of applications, system and network access Ease of configuration Management

Small sized N Networ etwor etwork[SSN k[SSN k[SSN]] ( sufficient addresses available) • A private Class C address is used: 192.168.1.0 to 192.168.1.255 (FC00::/7 for V6 security perspectives) • Dynamic or Static IP assignment? – It might be hard to maintain a DHCP server – Therefore for small sized network we may decide to use static IPs. – For large, IPv6 address auto-confuiguration • How about a DNS server? – Again, setting and maintaining a DNS for this size of network may not be beneficial – Servers on ISP level if needed.

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Internet and Intranet

Chapter-5. Designing Internet Systems and Servers [8 hours]

BCT IV/II

Internet and Intranet

Connec Connecting ting tthe he netw network ork to tthe he Int Internet ernet • In the design we used private IP addresses: – Computers can’t use Internet directly, there is a need for NAT functionality (require global Ipv6 not NAT) – There exists the advantage of security of network • It is decided to use a router with built-in NAT functionality for Ipv4 • It is not cost effective to host email and Web service inside the organization however based on the size it may setup • Therefore, such servers are outsourced to ISPs Mediu Medium m size sized d Netw Network ork (...